<html>
        <head>
                <meta charset = "utf-8">
        <script type = "text/javascript">
    let result = 5 * 2
    console.log(result)
    console.log(result === Math.pow(5,2))
    const Name = '张三'
    // alert(Name)
    console.log(Number.isFinite(15))
    console.log(Number.isFinite('15'))
    console.log(Number.isInteger(25))
    let message = "Hello world!"
    console.log(message)
    console.log(typeof message)
    console.log(message.length)
    let message1 = '\'Hello\' world'
    console.log(message1)
    let message2 = `Multiline
    string.`
    console.log(message2)
    console.log(message2.length)
    let html = `  <div>
     <h1>Title</h1>
     </div>`.trim()
     console.log(html)
     document.write(html)   
     let message3 = `Multiline\nstring.`
     console.log(message3)
     console.log(message3.length)
     let name = "0Nicholas"
     message = `Hello,\n ${name}.<br>`
     console.log(message)
     document.write(message)
     let count = 10
     price = .025
     message = `${count} items coust $${(count*price.toFixed(2))}.<br>`
     document.write(message)
     function fn() {
         return "Hello world!"
     }
     let message4 =`01 foo ${fn()} bar`

     document.write(message4)
     let name1 = 'Nicholas'
     message = `Hello, ${`my name is ${name1}`}.`
     console.log(message)
     var message5 =  SaferHtml`<p>${sender} has sent you a message.</p>`
     
        </script>
        </head>
        <body >
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
        </body>
        <style>
        </style>
    </html>